What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.

At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.

We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.


  • Profile Image

    Are character restrictions alphanumeric only?

    Asked by rscrental on May 05, 2010 at 05:53 PM
    Hi, working on a form with a matrix comprised of text boxes.  I want to restrcit entry of characters to these fields so that they are alphanumeric only -- essentially no commas or other special characters should be submitted with the form.  Anything built in or suggestions on how to remove pre- or post- submission?

    Getting the data out of the matrix has been difficult so we've thrown together an Excel spreadsheet that parses through the CSV to create properly tabulated data, but extraneous commas are killing the output.

    THANKS!
  • Profile Image
    JotForm Founder

    Answered by aytekin on May 06, 2010 at 02:58 PM
    I added your requests to our suggestions list. Thanks.
  • Profile Image

    Answered by serkan on May 27, 2010 at 10:27 AM
    You can add validation to matrix input fields by adding this class name to them

    validate[AlphaNumeric]

    Such as:

    <input class="form-textbox validate[AlphaNumeric]" type="text" size="5" name="q9_matrix[2][]" />

    if matrix is required try this


    <input class="form-textbox validate[required, AlphaNumeric]" type="text" size="5" name="q9_matrix[2][]" />


    I haven't tried this but it should work.